I suppose it would take the late Carl Sagan to count the number of unproduced movie scripts in Hollywood (“billions … and billions…”) and most of them probably earned their way into a studio dumpster.

However, here’s an interesting movie project I ran across while researching the mystery photos from “Invaders From Mars.” Pat H. Broeske wrote this Sept. 22, 1985, story on a semiautobiographical film about Steve Spielberg titled “Reel to Reel” by Gary David Goldberg. (A Spielberg spokesman said at the time that the project was “very inactive.”)
 
Among the people envisioned for the film were Martin Scorsese as a UCLA film professor and a dream sequence of a courtroom involving Judge Orson Welles, Mary Tyler Moore as a witness, and a prosecutor named "Miss Kael." 

ALSO

Carl Sagan and “Cosmos”

Gary David Goldberg on “Reel to Reel”